its only barely related but, I recall a couple of years ago when I worked in a data center, I was tired and being lazy with my chair tipped back. I could hear the sound of the air conditioning, the fans in the servers, hard drives, it is a very noisey environment... Then for a couple of seconds it went completely silent, when I realised this, sound came back abruptly.
I do hypnosis, I have made people incapable of seeing objects, unable to feel pain and unable to move their body.. I suspect its a possability that in fact a hypnotist could make you deaf, maybe go to a stage show and ask them to add it to the routine or something. *shrugs*